Telephone-signal.



PATENTBD APR, 24., 1906. RUDOLPH ECHTENBRG.

ANDRBAS VILHELM (CALLED WILHELM TELEPHONE SGNAL.

APPLwATIoN FILED nno.s.19o4.

NEW YORK. Ii Y'.

No. einem.

Specification of Lettere Patent.

Patented ri 24.1 19136.

.ppiiciitlon ileil December 8,1904. Seriiil No 235,968-

Be it known that I, ANDREAS, TiLiiicLi (called WiLiiiami) R'ijnoiriiFecii'rrixixiiiii, ii subject of" tlie King of eniniirk, residing at thecity of New York. borough o1'Y Biiiilinttzin, :iiiii Stute of New York,liuve invented cer- '-ziin new and useful Iinproi'iiiiients in Telefphone-Signals. of iviiieh the folloiifing is u i'iill, einer i exactdescription.

This ini1 `ntion relates to telepliiiine-sigmiis; and ilie oieei is tosere time iii telephonie eoinintinieiiiiiiin.

Geeusionfilly vri-.nn tivo persons aire in coin-- niunioe'tion byteiephone ii'` inrit-pens iiiut oney of lneln requests the other toiliold the wire. This necessitates one of tlie porties standing idle etthe teieplione until alie other is again reniiy to converse. Theinstrument must be heid off or' the hook, so the?, central office willnot .ss-over the connection 'between the parties, and it is necesszir ffor the waiting perty 'to hoid the instrument to his ear in lorder toknow when the other party has returned and token up his instrument.Considerebie time is sometimes occupied in this way, and it is in anycase a greet inconvenience to be forced to remain et the telephone undhold the instrument to tiie ear.

The object of the present invention is to.

enable tiro Waiting party to so dispose of iiis instrument tluit wiiilewaiting lie can be ottending to other matters and will not be coinpelied to lioiil the instrument to his ear. This .is accomplished byproviding n second hookswiton upon which the telephone-receiver is hungby oth porties when eitiier of them is reqiiestei to wait or hold thewire. This second iioolc controls ii siiunt-siroiiit around tlietransmitter, nud in movingr downward under the weight of the receiverit. closes iinil o ieiii; siiiii shunt-circuit zi number of times, i,ius cutting out and in tiie resistance of tiro transmitter andcorrespondingly varying' tile current on the line. 'l lieso variationsore inilii'eiteil liy u sharp olii-,k in euch telephone,- reeiiivier, sothat auch party knows when the other inis iiing up the instrument on thesu pleiiientiil hook. The receiver being of? tie iziiiin hook, tlio iin@is remiiieil in its bus ooniiition und the connection will noiJ be iisiiirlieii by the. central operator. When either ol tlie parties isagain ready for conversation, lie ,i'isiiiows the receiver from thesupplemen* tail hook, which :igiiin sends' ille pulsations i i l l l lover the iiiie, giving the suine sigiiiil as. before in iiotiitelephone-recur'vers und milling iiie waiting party to the instruiiieni.llio i'eiiioviii of the weit-ing piirtys iiisiiruiiieiit from the liooliefuiin sends tlie signal over tlio line 21ml .informs the lirst partythat coiiver sation may begin.

in apparatus und the eiriiiits For Carrying out the zi'oove iilen nreiliiistriiieil iii. the iiieonipznii'ing iiruiiinge; but it wiil beiiniierstood tlnit various iiioililii'iiiions of ilie spiL iiiiiiiiniiner of ifi'eiiiing; tho iiigiiiiis; und ro- 'iiiiiing ilieconnection um.;Y be ileviiioii ii'i'tliout ilepiirtinej from the spiritoi my iiii'enV` tion, ii being understood tlmt i :ini the first to.iroviiie signois of any diameter, whether iiiiiiiole. visible, orotherwise, for iiie purpose referred to.

Figure l is iin elevation of an ordinary desk-telephone set equippedwith devices for carrying out my invention Fig. l? is o seotion throughthe stiiniliird o the instrument, showing tlie novel iittiieiiiiients inplan; unil Fig. 3 is a diagram of tiio circuits where tivo subscribersaire conne-@teil together through oentriii-oliiee connections.

it wiil im understood tluit iiltlioiigli i liaivo shown only u. ileslrset ol instruments the iiivention is ii iplieiible to :my other style oftelephone-siii soril or's sist..

A is iiirni'isiiiitter, und B the reeeiver, of ani'ordiiuiryfonsiruiilion.

o is the usuel hook-switch, upon which the reoeiver normulijY hangs:wiien out of use. The stniiilurd (i, upon which the two instruments iiresupported, also supports o second hook-switch e, aiiiiiited to su )portilio ro i'iii/er B. This hoof: is pivoeilito the stond@ iiril iiy meansof ii eliimping-ringf, insulated from the stiiiiiliiril und iiisosupporting 1i iiietullio limi-liet j, iiziving u coiieeiiirii row ofVrojections g' on its forward edge. The liooli is niountoil to suingrbetween liiiiit-stops 'i i in n vertical pliiiie piirnllel to the broelet,ziiid it carries u itoiitii -`iiinger o, niiiiplteii to milkoiiniibrmik Contact successively with the projections y when moving; ineither lii'i-etioii from one sto pin to i-lie other. 'llie Contact 0 isireforiibiy out oi elei-trieiil commit with lie inni-liet imi! ronnie-tprojeetions iiiereoii when iit eituor iiiiiit of its stroke, iiiiil iiiei-ircuit ooiitroiled thereby is consequently normally o en, Thiscontact-linger f iiiiis iziie teriiiimi of iieiroiiit, (iiiilieiileil hythe wire 10,)

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io governor majiv he applied zo been duly connected for conversation 3omost position.

4o open the shunt-circuit Ll 5 pulses take the followi 5o pulses, whichwho then reino oo and the conversation is again taken u i leadingthrough the lnilloiv arm of the hook.

The other terminal of the saine circuit is the hracket g itself, towhich another wire may be connected at the pivot-screw ptor at anyspecial hinding-post provided for the purpose. .5i spring a is used tocarr \Y the hook. npvvard to its normal position whenever the weight ofthe receiver`- is removed thereiron.. and. if desired. a dash-pot orother motionto the switch-arm he arm in either dito time the movementoi'i rection, such devices` heini: ver)` common known in the art.

Fig. 3 shows a diagram of circuits. Each suhscrihers set includes alocal circuit containing a battery, induction-coil, and transmitter, theoperation of which in connection with myinventionwillnow he described.1We will assume that suhscrihers X and Y have through T and thatsuhsrihe'r Y X to hold the wire. B

the central oilice has requested suhseriher Both subscribers then placetheir receivers upon the supplemental hooks c, and this is\t,ne.condition we ,find the circuits in at Fie, 3. .it will he seenthat the calling-circuit, incaiding the hells m oi both stations, isopen by rea-son of the main hook I; being relieved ot the weight of thereceiver and 1n its upper- Therefore the central oper atoi' will get alousy test Whenever she attempts to connect either subscriber X. or Ywith any other calling suhscriher. it will also he seen that the localtransmitter-oircuits t, containing the batterxY '3 and riniarv coil 3,are closed hy the hook-switch Non' when'subscriber Y is again ready totalla he lilts his receiver oil` the hook c. This allows the hook torise and successively close and around his transmitter. The transmitterheinpy oi consider'- ahle resistance, 4hese interruptions cause strongrsharp high-potential impulses to he induced in the secondarr coil (i,1which hn- 'ng circuit: wire 7, receiver ol' stationY, wire il, receiverot station X, wire t), s\.'itchlever I) oi' station X, -wire l0,switch-lever b ol station Y, to coil rlhus hoth receivers are allcctedhy these iincausc their diaphraguis to give out loud sharp clicks, whichcan he plainlj,r heard hy both parties atI considerable distance fromthe instrument itself. This signal calls suhseriher X back to thetele-phone, vos his receiver from hook e, causing another signal to hesent over they line to Y hy reason of the. short-circuiting ol theItransmitter aty tho X station. Both 'Y and K now 'snow that each isready to talla,

. ln theI meantime both parties have heen lree to attend to othermatters, Y to obtain the data or attend to such o her matters as gaveyhim reason to ro( uest to hold the wire and X to attend to any otherbusiness he. mightlsay,

the transmitter is opened to avoid `consumption of the transhave hciorehiin.

initter-hatterv and possi ile heating ot the transmitter. `"ifhen oneparty asks the other to hold the wire, he waits until he gets the seriesoi clicks in his telephone, indicating that the other party understandsand has hung his receiver on the supplemental hook. lle, then hangs his.own receiver on the supplemental hook, thus indicatixw to the secondparty that there is a mut-ual understanding and that either party can hecalled tothe telephone h v .lifting the receiver from the supplementalhook, and thus sending the pulsations over the line to The supplementalhooi( will oi course only bo used in the cases speeiiied-that is, where'communicating oarties wish to hold the wire.

the receiver and operated whenever the heavy impulses are sent over theline. it iS also not essential that a series of impulses he used i'orthe indications, as any distinctive signal will serve the saine purpose.Likewise it is to he understood that the switchn arms e may he operatedhv hand instead the weight ol the receiver, in which case the receivercould rest upon a table or he placed anywhere except. on the main hookthe line is held, if my invention is applied to what is known as 4thecommon battery" or "central energy" telephone systems, the sanneconnections will he used-that is to the transmitter will he shunted inthe same manner andthe opening and olosinff of such shunt will createfractie-ct anon the ine to which the receivers will respond.

liaving described iny. invention, l claimt. ln a telephone system, thecombination of a, central olllre and a pluralityr of' subscribersstations connected therewith with means whereby interconnectedsuhsorihers can send call-shgnals to each other While the central oillcecannot call either of the connected subscrihors.

2. in a telephone system, the combination whilethe other receiver,-

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95 1 receiver would again he sounded of a central office and a pluralityof subscribers stations connected therewith, and each embracing acall-signal, with means for disconnecting the call-signals ofinterconnected substations, a second call-signal for each substation.adapted to be thrown into circuit when the first call-signal isdisconnected and means at each substation for operating the secondcall-signal.

3. In a telephone system, substations each provided with a call adaptedto be actuated rom the central' oflice and with'a second call adapted tobe actuated from another substation.

4. In a telephone system, substations each prrovided with a call adaptedto be actuated om the central office and with a second call adapted tobe actuated from another substation, the second call being operativeonly when the first is inoperative.

5. The combination of two telephone substations each provided with aswitch controlling the main circuit between the stations,

' means for transmitting calling-signals over said main circuit from onesubstation to another and signal devices at each station operative u onsaid calling-signals onl when the telep one-receiver is connected orcont versation. y r

6. In a telephone system, substations provided with means for sending acall -signal While the respective transmitters and receiversfof'the sustations are connected for conversation.` 3 5 7. In a telephone system,substations provided with means for sending and means for receiving acall-signal whi e the respective transmitters and receivers o thesubstations are connectedfor conversation.

8. In a telephone system, a plurality of substations each rovided4 withmeans for sending-a. series oflii h-potential electric impulses over theline w 'le the transmitter` and receiver-are connected for conversation.

9. In a telephone system, a plurality of substations `each ovided withmeans for sending a series of l' h-potential electric impulses over theline w 'le the transmitter and receiver are connected for conversation,and 5o call-signals at each station responsive to `such signals when thetransmitter and receiver are connected for conversation.

10. In a telephone system, subst ations provided witha hook-switch andtwo call-signals, said switch adapted, when sustaining an instrument, toconnect one of the signals in circuit, and when not sustaining aninstrument, to connect the other signal in circuit.

11. I'n a telephone system, substations provided with two hook-switchesand tuo al`- signals, one hook-switch, when actuated b v the weight ofan instrument, being adapted to send a signal-current over line7 whilethe other hook switch, when sustaining an instrument, holds one signalin condition to rcspond to calling-current.

12. In a telephone system, substations each provided with a call, acentral otlice and means to actuate said calls and means toconnectsubstations, and a call in each substation and means to actuate asimilar call in a connected substation.

13. In a tele )hone system, a numbc` of substations eac provided withtwo hookswftches and two signal -calls, means controlled by onehook-switch for sending a signal over the line when actuated by theweight of an instrument, and means actuated by the other hook-switch forcontrolling one of the signal-calls and when actuated by the weight ofan instrument, holding the said signal-call in an o erative condition.

14. n a telephone system, the combination of a central oiice and aplurality of substations and wires for connecting the same therewith,means at the central otlice for connecting the wires of two selectedsubstations, means at the substations for producing an electricalcondition upon the connected wire indicative to the central ollice thatthe substations are in use, and means for sending signals between thesubstations during the continuance of the said electrical condition.

In witness whereof I subscribe. my signature in the presence of twowitnesses.

ANDREAS VlLllELlll (CALLED WILHELM) RUDOLPH FllUlllENBUltG. Witnesses:

WM. A. RosENnAUM, WALDo M. CnAPiN.

